摘要：<!DOCTYPE html><html ><head> <meta charset="UTF-8"> <title>学习CSS第三节课</title> <style type="text/css"> .box{width:100px;height: 100px;border
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>学习CSS第三节课</title>
<style type="text/css">
.box{width:100px;height: 100px;border:1px solid #ccc;border-radius: 50px}
.box1{width:100px;height: 100px;border:1px double #ccc;}
.main{width:100px;height: 100px;border-top: 1px solid red; background:#ccc;}
button{border:none;}
.shadow {width: 300px;height: 40px;box-shadow: 0px 5px 25px #ccc inset; /*border:1px solid #ccc;*/}
</style>
</head>
<body>
<div class="box" > </div>
<div class="box1"> </div>
<div class="main"></div>>
<button>登录</button>
<div class="shadow"></div>
</body>
</html>
批改老师：天蓬老师批改时间：2018-12-02 16:36:14
老师总结：边框是盒模型中最重要的,最丰富的组件之一,因为它不像padding和margin,只能设置宽度,它还可以设置样式和颜色,并且,边框可以还可以做出许多有用的功能件
